I have a Campbell hausfeld 22gal 5 hp vertical air compressor my brushes recently went out and while I was replacing them figured I would do an over haul well when I put it back together and secured it its like it doesn't want to run correctly I can hear a knocking sound and it gets super hot what would cause it to do this

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Go to http://www.chpower.com/manualsearch/ (its the Campbell-Hausfeld website) and put TF2912 in the 'Find Model' search box and you'll get the operating instructions, parts lists and other information on your compressor.

I have not been able to find brushes for your type of compressor. I find a close match on ebay and shave/sand to size. Measure your brushes. Search ebay for "carbon brushes" looking for best price and size needed. Make sure that the armature is still good because the brushes will wear very fast if arm. is bad. Good luck